91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
package fun
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import "time"
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import "math"
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import "image"
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import "image/color"
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import "tomo"
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import "art"
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import "art/shapes"
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var clockCase = tomo.C("tomo", "clock")
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// AnalogClock can display the time of day in an analog format.
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type AnalogClock struct {
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entity tomo.Entity
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time time.Time
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}
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// NewAnalogClock creates a new analog clock that displays the specified time.
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func NewAnalogClock (newTime time.Time) (element *AnalogClock) {
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element = &AnalogClock { }
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element.entity = tomo.GetBackend().NewEntity(element)
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element.entity.SetMinimumSize(64, 64)
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return
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}
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// Entity returns this element's entity.
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func (element *AnalogClock) Entity () tomo.Entity {
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return element.entity
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}
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// Draw causes the element to draw to the specified destination canvas.
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func (element *AnalogClock) Draw (destination art.Canvas) {
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bounds := element.entity.Bounds()
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state := tomo.State { }
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pattern := element.entity.Theme().Pattern(tomo.PatternSunken, state, clockCase)
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padding := element.entity.Theme().Padding(tomo.PatternSunken, clockCase)
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pattern.Draw(destination, bounds)
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bounds = padding.Apply(bounds)
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foreground := element.entity.Theme().Color(tomo.ColorForeground, state, clockCase)
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accent := element.entity.Theme().Color(tomo.ColorAccent, state, clockCase)
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for hour := 0; hour < 12; hour ++ {
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element.radialLine (
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destination,
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foreground,
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0.8, 0.9, float64(hour) / 6 * math.Pi)
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}
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second := float64(element.time.Second())
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minute := float64(element.time.Minute()) + second / 60
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hour := float64(element.time.Hour()) + minute / 60
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element.radialLine(destination, foreground, 0, 0.5, (hour - 3) / 6 * math.Pi)
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element.radialLine(destination, foreground, 0, 0.7, (minute - 15) / 30 * math.Pi)
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element.radialLine(destination, accent, 0, 0.7, (second - 15) / 30 * math.Pi)
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}
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// SetTime changes the time that the clock displays.
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func (element *AnalogClock) SetTime (newTime time.Time) {
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if newTime == element.time { return }
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element.time = newTime
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element.entity.Invalidate()
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}
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func (element *AnalogClock) HandleThemeChange () {
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element.entity.Invalidate()
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}
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func (element *AnalogClock) radialLine (
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destination art.Canvas,
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source color.RGBA,
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inner float64,
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outer float64,
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radian float64,
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) {
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bounds := element.entity.Bounds()
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width := float64(bounds.Dx()) / 2
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height := float64(bounds.Dy()) / 2
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min := bounds.Min.Add(image.Pt (
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int(math.Cos(radian) * inner * width + width),
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int(math.Sin(radian) * inner * height + height)))
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max := bounds.Min.Add(image.Pt (
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int(math.Cos(radian) * outer * width + width),
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int(math.Sin(radian) * outer * height + height)))
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shapes.ColorLine(destination, source, 1, min, max)
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}
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